The PH scale is from 0-14
0 being the most acidic and 14 being the most alkaline.
Ph is dependant on the concentration of Hydrogen (H+) or Hydronium Ions (H3O+)
Skin has a PH of around 5.5. Most personal care products fall in the range of 5.3 - 5.8 and rarely up to 7 (neutral) EXCEPTIONS do apply and we will get into some of them later on and also learn to make PH buffer solutions!
Rarely is a formula made and finished at just the right temperature, this leave us to adjust the PH accordingly.
PH on a logarithmic scale.
Anhydrous products have no PH.
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